Underdosing of aspirin, sequela

This code signifies a long-term complication or residual effect stemming from a patient's insufficient intake or cessation of aspirin. It indicates that the underdosing event itself is no longer active, but its consequences are still present and being addressed.

Apply this code when a patient presents with a condition, such as a recurrent cardiovascular event (e.g., myocardial infarction, stroke) or worsening of a chronic inflammatory condition, that is directly attributed to a past episode of underdosing aspirin. This code is appropriate for follow-up encounters where the sequela is the primary focus of treatment.

• Always sequence this code after the code for the specific sequela (e.g., I21.9 for myocardial infarction).
• Ensure documentation clearly links the current condition to a past underdosing of aspirin.
• Do not use this code for acute underdosing; instead, use the appropriate acute underdosing code with an initial or subsequent encounter seventh character.